Question

 Biradial symmetry and lack of cnidoblasts are the characteristics of [CBSE AIPMT 2006]

(a) Starfish and sea anemone

(b) Ctenoplana and Beroe

(c) Aurelia and Paramecium

(d) Hydra and starfish

Answer/Explanation

Ans. (b)

Ctenoplana and Beroe lack cnidoblasts and have biradial symmetry. These belong to phylum-Ctenophora.
Hydra, sea anemone and Aurelia are coelenterates which have cnidoblasts. Although sea anemone has biradial symmetry.

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